<template>
    <div>
         <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
<el-card>
        <!-- 头部警告区域 -->
          <el-alert title="注意: 只能为第三级分类设置相关参数" type="warning" :closable="false"  show-icon></el-alert>
          <!-- 选择商品分类区域 -->
          <el-row class="cat_opt">
              <el-col>
                  <span>选择商品分类:</span>
                  <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps"  @change="handleChange"></el-cascader>
              </el-col>
          </el-row>
          <!-- tab 页签区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
    <!-- 添加动态参数的面板 -->
    <el-tab-pane label="动态参数" name="many">
        <!-- 添加参数的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
        <!-- 动态参数表格 -->
        <el-table :data="manyTabData" border stripe>
            <!-- //展开行 -->
        <el-table-column type="expand">
                <template slot-scope="scope">
            <!-- //循环渲染tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
        </el-table-column>
            <!-- 索隐列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini"  @click="removeDialog(scope.row.attr_id)">删除</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-tab-pane>
    <!-- 添加静态属性的面板 -->
    <el-tab-pane label="静态属性" name="only" :disabled="isBtnDisabled">
        <!-- 添加静态属性的按钮 -->
        <el-button type="primary" size="mini" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 静态属性表格 -->
        <el-table :data="onlyTabData" border stripe>
            <!-- //展开行 -->
        <el-table-column type="expand">
                <template slot-scope="scope">
            <!-- //循环渲染tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
        </el-table-column>

            <!-- 索隐列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeDialog(scope.row.attr_id)">删除</el-button>
                </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>
    </el-tabs>
</el-card>
<!-- 添加参数的对话框 -->
<el-dialog
  :title="'添加'+ titleText"
  :visible.sync="addDialogVisible"
  width="50%" @close="addDialogClosed">
  <!-- 添加参数的对话框 -->
  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="addForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>
<!-- 修改参数的对话框 -->
<el-dialog
  :title="'修改'+ titleText"
  :visible.sync="editDialogVisible"
  width="50%" @close="editDialogClosed">
  <!-- 修改参数的对话框 -->
  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
  <el-form-item :label="titleText" prop="attr_name">
    <el-input v-model="editForm.attr_name"></el-input>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger: 'hover'
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //被激活的页签名称
            activeName:'many',
            // 动态参数的数据
            manyTabData:[],
            //静态属性的数据
            onlyTabData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{
               attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                    { required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制按钮与文本框的切换显示
            inputVisible:false,
            //文本框中输入的内容
            inputValue:''

        }
    },
    created(){
        //获取所有的商品分类列表
        this.getCateList()
    },
    methods: {
       async getCateList(){
            const {data:res}= await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist=res.data
            // console.log( this.catelist);
            this.$message.success('获取商品分类成功')
        },
        //级联选择框选中项变化会触发这个函数
        handleChange(){
        this.getParamsData()
            
        },
        handleTabClick(){
            // console.log(this.activeName);
        this.getParamsData()

        },
        //获取参数的列表数据
       async getParamsData(){
               //证明选中的不是三级分类
          if(this.selectedCateKeys.length!==3){
              this.selectedCateKeys=[]
              this.manyTabData=[]
              this.onlyTabData=[]
              return
          }
            //证明选中的是三级分类
            // console.log(this.selectedCateKeys);
            //根据所选分类的id和当前所处的面板 获取对应的参数
            const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            // console.log(res);
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]
                //控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框输入的值
                item.inputValue=''
            })
            // console.log(res.data);
            
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败')
            }
            // console.log(res.data);
            if(this.activeName==='many'){
                this.manyTabData=res.data
            }else{
                this.onlyTabData=res.data

            }
            
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
         //点击按钮添加参数
    addParams(){
        this.$refs.addFormRef.validate(async valid => {
            if(!valid) return
            const { data: res}= await this.$http.post(`categories/${this.cateId}/attributes`,{
                attr_name: this.addForm.attr_name,
                attr_sel: this.activeName,
            })
            if(res.meta.status!==201){
                return this.$message.error('添加参数失败')
            }
            this.$message.success('添加参数成功')
            this.addDialogVisible=false
            this.getParamsData()
        })
    },
    //点击按钮 显示修改的对话框
    async showEditDialog(attr_id){
        //查询当前参数的信息
        const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
            params:{attr_sel:this.activeName}
        })
        if(res.meta.status!==200){
            return this.$message.error('获取参数信息失败')
        }
        this.editForm=res.data
        this.editDialogVisible=true
    },
    //重置修改的表单
    editDialogClosed(){
        this.$refs.editFormRef.resetFields()
    },
    //点击按钮 修改参数信息
    editParams(){
        this.$refs.editFormRef.validate(async valid=>{
            // console.log(valid);
            if(!valid) return
           const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name:this.editForm.attr_name,
                attr_sel:this.activeName
            })
            // console.log(res);
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败')
            }
            this.$message.success('修改参数成功')
            this.getParamsData()
            this.editDialogVisible=false 
        })
    },
    //点击按钮 删除参数/属性
    async removeDialog(attr_id){
         const confirmResult= await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
    //    console.log(confirmResult);
       //用户取消了删除的操作
    if(confirmResult!='confirm'){
        return this.$message.info('已经取消删除')
    }
    const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
    if(res.meta.status!==200){
        return this.$message.error('删除失败')
    }
    this.$message.success('删除成功')
    this.getParamsData()

    },
    //文本框失去了焦点 或者按下了enter键 都会触发
    async handleInputConfirm(row){
// console.log('ok');
        if(row.inputValue.trim().length===0){
            row.inputValue=''
        row.inputVisible=false
        return
        }
        // 如果没有return 证明输入了正确的内容 需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        //需要发送请求保存这一次操作
       this.saveAttrVal(row)


    },
    //将对attr_vals的操作保存到数据库中
    async saveAttrVal(row){
//需要发送请求保存这一次操作
        const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name: row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status!==200){
            return this.$message.error('修改失败')
        }
        this.$message.success('修改成功')
    },
    //点击按钮 显示文本输入框
    showInput(row){
        row.inputVisible=true
        //让文本框自动获取焦点 .$nextTick方法的作用 就是当页面上的元素被重新渲染之后 才会调用回调函数中的代码
          this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });

    },
    //删除对应的参数可选项
    handelClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVal(row)

    }

    },
    computed:{
        //如果按钮需要被禁用则返回true 否则返回false
       isBtnDisabled() {
           if(this.selectedCateKeys.length!==3){
               return true
           }
           return false
       },
        //当前选中的三级分类的Id
    cateId(){
        if(this.selectedCateKeys.length===3){
            return this.selectedCateKeys[2]
        }
        return null
    },
    //动态计算标题的文本
    titleText(){
        if(this.activeName==='many'){
            return '动态参数'
        }else{
            return '静态属性'
        }
    },
    },
   
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}
</style>